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The Boxster RS 60 Spyder. - Porsche

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VarioCam Plus<br />

<strong>The</strong> <strong>Boxster</strong> <strong>RS</strong> <strong>60</strong> <strong>Spyder</strong>:<br />

Propulsive power and low in consumption<br />

thanks to VarioCam Plus.<br />

<strong>The</strong> <strong>Boxster</strong> <strong>RS</strong> <strong>60</strong> <strong>Spyder</strong> creates enthusiasm<br />

not least due to its impressive thrust and its<br />

high reserves in power. One reason for this is the<br />

6-cylinder boxer engine with VarioCam Plus.<br />

<strong>The</strong> <strong>Boxster</strong> <strong>RS</strong> <strong>60</strong> <strong>Spyder</strong> – like all <strong>Boxster</strong> models –<br />

has this system to adjust the intake camshafts and<br />

to change the valve lift of the intake valves. In addition<br />

to the best running quality, low fuel consumption and<br />

fewer exhaust emissions, above all VarioCam Plus<br />

makes high performance and torque values possible.<br />

And VarioCam Plus is a 2-in-1 engine concept. It<br />

adjusts itself to the respective demand for power.<br />

<strong>The</strong> switch occurs without being noticed by means<br />

of the Motronic ME7.8. This results in spontaneous<br />

acceleration and extremely low engine noise.<br />

s Schematic representation of VarioCam Plus<br />

<strong>The</strong> valve-lift adjustment system consists of switchable<br />

bucket tappets that are guided by an electro-hydraulic<br />

switch valve. <strong>The</strong>y consist of 2 interlocking tappets<br />

that can be locked by means of a bolt. Either a large<br />

cam works on the intake valves via the exterior tappet<br />

or a small cam via the internal tappet. <strong>The</strong> intake<br />

control times are infinitely variable via a camshaft<br />

controller attached to the front of the camshaft that<br />

works according to the vane principle. <strong>The</strong> control<br />

occurs via an electro-hydraulic control valve.<br />

For example, in order to optimise the petrol intake<br />

during the warm-up phase at low temperatures,<br />

VarioCam Plus selects large valve lifts with retarded<br />

valve timing. In the mid engine speed and low load<br />

range, the system reduces fuel consumption and<br />

exhaust emission by switching to small valve lifts<br />

with advanced valve timings.<br />

To achieve maximum power and torque, the valve<br />

lift is raised and the timing advanced. n

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